Photovoltaic power plants are now almost the lowest standard for every family! However, for families who have just installed PV power plants, what they can do is to listen carefully to the installers. For some specific problems of the power station Solar Panels H Beam, they are often Nothing to know! Today, this article edited one of the several factors that can affect the power generation of PV modules,hope to help those who are in the PV industry!
During the working process, due to the partial shadow of the shadow and the degree of dust settlement, the pollution of bird droppings will cause the “hot spot effect”. The occluded part will not provide power contribution and become energy-consuming load inside the component, and cause The local temperature of the component rises, and the overheated area may cause the EVA to accelerate aging and yellowing, so that the transmittance of the region is lowered, thereby further deteriorating the hot spot, resulting in an increase in failure of the solar cell module.
The temperature coefficient of the crystalline silicon battery is generally -0.4% to -0.45% / ° C, and the single crystal temperature coefficient is smaller than polycrystalline. Changes in the ambient temperature of the outside world and the heat generated by the components during operation cause the temperature of the components to rise, which also causes the power generation of the components to decrease.
Cleaning and maintenance
When the components are in the field for a long time, dust and other debris will fall on the glass, and a large amount of dust or dust will settle for a long time, which will weaken the penetration of sunlight and cause the surface temperature of the components to rise and affect the power generation efficiency of the components. When the surface of the component is dusty, the difference between the power generation before cleaning and the cleaning is 5.7%. If the cleaning is not carried out for a long time, the difference in the amount of dirt generated in the surface of the component can reach more than 10%.
Due to factors such as cell cracking, black core, oxidation, and virtual soldering, as well as material defects such as back sheets and aging of long-term use, the power of the components is affected during long-term operation, resulting in low power generation of the components. It is noteworthy that the crystal structure of the single crystal determines its superior performance in resisting cracking.
During the long-term work of the external components, the water vapor permeates into the interior of the module through the backing plate, causing the EVA to hydrolyze. The acetic acid ions cause metal ions to precipitate in the glass, resulting in a high bias voltage between the internal circuit and the frame of the module, resulting in electrical degradation. The amount of power generation has dropped dramatically.
The weather is also one of the factors that affect the power generation efficiency of the components. In the rainy weather and thicker clouds, the intensity of sunlight is reduced, the solar light absorbed by the cell is less, and the power generation is reduced. The low-light response of single crystal is better than polycrystalline under low irradiation. In the case where the conversion efficiency of the solar cell module is constant, the amount of power generated by the photovoltaic system is determined by the radiation intensity of the sun. The amount of electricity generated by a photovoltaic power plant is directly related to the amount of solar radiation. The radiation intensity and spectral characteristics of the sun change with meteorological conditions.
Summary: The above analysis only affects the power generation of components from the components themselves and external environmental factors. In addition to the factors mentioned above affecting power generation efficiency and power generation, there are also components in the working process due to electrical system terminals and other factors. In the process of power attenuation, power generation reduction, etc., there are still process improvements, technology enhancements, material development and more related research to solve and improve the factors affecting the power generation of components.